does the tar in cigarettes cause cancer harmful chemicals smoking directly damage lung cells, causing DNA mutations that increase risk. Over time, these damaged cells grow abnormally, leading to tumor formation in the lungs. Quitting smoking Tobacco and Cancer | Cancer

Tobacco and Cancer Cancer CDC Smoking: Effects, Risks, Diseases, Quitting & Solutions Cancers linked to tobacco use make up 40% of all cancers diagnosed in the United States CDC Online Newsroom CDC Cigarette smoke contains thousands of chemicals, many of which are toxic and harmful to the human body. Here's a detailed breakdown of some of the most dangerous constituents and their effects: 1. The image of blackened lungs isn't a prop. It's the harsh reality of smoking. While healthy lungs are a pinkish color, cigarette smoke causes permanent, heavy staining from tar and other particulate

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